1/* Expression parsing for plural form selection.
2   Copyright (C) 2000-2001, 2003 Free Software Foundation, Inc.
3   Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
4
5   This program is free software; you can redistribute it and/or modify it
6   under the terms of the GNU Library General Public License as published
7   by the Free Software Foundation; either version 2, or (at your option)
8   any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Library General Public License for more details.
14
15   You should have received a copy of the GNU Library General Public
16   License along with this program; if not, write to the Free Software
17   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
18   USA.  */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#include <ctype.h>
25#include <stdlib.h>
26#include <string.h>
27
28#include "plural-exp.h"
29
30#if (defined __GNUC__ && !defined __APPLE_CC__) \
31    || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
32
33/* These structs are the constant expression for the germanic plural
34   form determination.  It represents the expression  "n != 1".  */
35static const struct expression plvar =
36{
37  .nargs = 0,
38  .operation = var,
39};
40static const struct expression plone =
41{
42  .nargs = 0,
43  .operation = num,
44  .val =
45  {
46    .num = 1
47  }
48};
49struct expression GERMANIC_PLURAL =
50{
51  .nargs = 2,
52  .operation = not_equal,
53  .val =
54  {
55    .args =
56    {
57      [0] = (struct expression *) &plvar,
58      [1] = (struct expression *) &plone
59    }
60  }
61};
62
63# define INIT_GERMANIC_PLURAL()
64
65#else
66
67/* For compilers without support for ISO C 99 struct/union initializers:
68   Initialization at run-time.  */
69
70static struct expression plvar;
71static struct expression plone;
72struct expression GERMANIC_PLURAL;
73
74static void
75init_germanic_plural ()
76{
77  if (plone.val.num == 0)
78    {
79      plvar.nargs = 0;
80      plvar.operation = var;
81
82      plone.nargs = 0;
83      plone.operation = num;
84      plone.val.num = 1;
85
86      GERMANIC_PLURAL.nargs = 2;
87      GERMANIC_PLURAL.operation = not_equal;
88      GERMANIC_PLURAL.val.args[0] = &plvar;
89      GERMANIC_PLURAL.val.args[1] = &plone;
90    }
91}
92
93# define INIT_GERMANIC_PLURAL() init_germanic_plural ()
94
95#endif
96
97void
98internal_function
99EXTRACT_PLURAL_EXPRESSION (const char *nullentry, struct expression **pluralp,
100			   unsigned long int *npluralsp)
101{
102  if (nullentry != NULL)
103    {
104      const char *plural;
105      const char *nplurals;
106
107      plural = strstr (nullentry, "plural=");
108      nplurals = strstr (nullentry, "nplurals=");
109      if (plural == NULL || nplurals == NULL)
110	goto no_plural;
111      else
112	{
113	  char *endp;
114	  unsigned long int n;
115	  struct parse_args args;
116
117	  /* First get the number.  */
118	  nplurals += 9;
119	  while (*nplurals != '\0' && isspace ((unsigned char) *nplurals))
120	    ++nplurals;
121	  if (!(*nplurals >= '0' && *nplurals <= '9'))
122	    goto no_plural;
123#if defined HAVE_STRTOUL || defined _LIBC
124	  n = strtoul (nplurals, &endp, 10);
125#else
126	  for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++)
127	    n = n * 10 + (*endp - '0');
128#endif
129	  if (nplurals == endp)
130	    goto no_plural;
131	  *npluralsp = n;
132
133	  /* Due to the restrictions bison imposes onto the interface of the
134	     scanner function we have to put the input string and the result
135	     passed up from the parser into the same structure which address
136	     is passed down to the parser.  */
137	  plural += 7;
138	  args.cp = plural;
139	  if (PLURAL_PARSE (&args) != 0)
140	    goto no_plural;
141	  *pluralp = args.res;
142	}
143    }
144  else
145    {
146      /* By default we are using the Germanic form: singular form only
147         for `one', the plural form otherwise.  Yes, this is also what
148         English is using since English is a Germanic language.  */
149    no_plural:
150      INIT_GERMANIC_PLURAL ();
151      *pluralp = &GERMANIC_PLURAL;
152      *npluralsp = 2;
153    }
154}
155